DTC P0480: Low Fan Control (LFC)/Fan Control 1 (FC1) Primary Circuit Malfunction
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P0480 - LOW FAN CONTROL (LFC)/FAN CONTROL 1 (FC1) PRIMARY CIRCUIT MALFUNCTION
| For Relay Controlled Electric Cooling Fan | |||
| Description: | Monitors the LFC or fan control (FC) for 1 speed fan applications, primary circuit output from the powertrain control (PCM). The test fails when the PCM grounds the LFC/FC circuit and excessive current draw is detected on the LFC/FC circuit; or with the LFC/FC circuit not grounded by the PCM the voltage is not detected on the LFC/FC circuit (the PCM expects to detect VPWR voltage coming through the low speed FC relay coil to the LFC/FC circuit) | ||
| Possible Causes: |
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| Diagnostic Aids: | When the LFCF PID reads YES, a fault is currently present. During the key on, engine off (KOEO) self-test, the cooling fan is cycled on and off. A short to voltage can only be detected when the PCM is grounding the LFC/FC circuit. During the KOEO and key on, engine running (KOER) self-test, the LFC/FC circuit is cycled on and off. | ||
| For Variable Speed Electric Cooling Fan | |||
| Description: | This test checks the fan control-variable (FCV) output circuit. The DTC sets if the powertrain control module (PCM) detects the voltage on the FCV circuit is not within the expected range. | ||
| Possible Causes: |
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| Diagnostic Aids: | During the key on, engine off (KOEO) self-test, the cooling fan is cycled on and off. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Freestar/Monterey | GO to KF: Fan Control (FC) Relays STEP KF16. | GO to KF: Fan Control (FC) Relays STEP KF16. | GO to KF: Fan Control (FC) Relays STEP KF49. |
| Crown Victoria, Grand Marquis, Town Car, Five Hundred, Freestyle, Montego | GO to KN: Variable Speed Electric Cooling Fan STEP KN1. | GO to KN: Variable Speed Electric Cooling Fan STEP KN1. | GO to KN: Variable Speed Electric Cooling Fan STEP KN7. |
| LS, Thunderbird | GO to KN: Variable Speed Electric Cooling Fan STEP KN12. | GO to KN: Variable Speed Electric Cooling Fan STEP KN12. | GO to KN: Variable Speed Electric Cooling Fan STEP KN19. |
| All others | GO to KF: Fan Control (FC) Relays STEP KF1. | GO to KF: Fan Control (FC) Relays STEP KF1. | GO to KF: Fan Control (FC) Relays STEP KF43. |